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At least 415 records · Page 23Linked to original sources
PubMed2000

Shear bond strengths of orthodontic plastic brackets.

The purpose of the present study was to evaluate the shear bond strengths of plastic brackets and the influences of the bracket filler contents on the bonding. The shear bond strengths of 4 plastic brackets (Spirit; Spirit MB; Clear Bracket; Aesthetic-Line) bonded to enamel with 4 orthodontic adhesives (Orthomite Superbond; System 1+; Transbond XT; and Kurasper-F) were compared with the strength of a conventional metal bracket. The findings of this study indicated the following: (1) shear bond strength of the 4 plastic brackets was significantly lower than that of the conventional metal brackets (P <.05), with most of the values ranging from 3 MPa to 6 MPa; (2) when comparing the bond strengths of plastic brackets, Aesthetic-Line had the largest value followed by Spirit MB, Spirit, and Clear Bracket, and when the plastic brackets were bonded with Orthomite Superbond, they showed relatively stronger bond strengths than when bonded with the other adhesives. Clear Bracket showed relatively lower values especially when bonded with System 1+; (3) the application of primer did not increase the durability of the bond strengths when bonding Spirit and Clear brackets; and (4) fillers contained in each plastic bracket ranging from 9.18% to 19. 52% were fairly well distributed and showed the same morphology of a fiber type 10 microm in diameter with different lengths. The filler concentration tended to correlate with the bond strength. The exposed fillers on the bracket base surface may play a more important role in plastic bracket adhesion than the macro-morphology of the base surface.

Dental Bonding↗
PubMed2002

Rapid ocular dominance plasticity requires cortical but not geniculate protein synthesis.

Synaptic plasticity is a multistep process in which rapid, early phases eventually give way to slower, more enduring stages. Diverse forms of synaptic change share a common requirement for protein synthesis in the late stages of plasticity, which are often associated with structural rearrangements. Ocular dominance plasticity in the primary visual cortex (V1) is a long-lasting form of activity-dependent plasticity comprised of well-defined physiological and anatomical stages. The molecular events underlying these stages remain poorly understood. Using the protein synthesis inhibitor cycloheximide, we investigated a role for protein synthesis in ocular dominance plasticity. Suppression of cortical, but not geniculate, protein synthesis impaired rapid ocular dominance plasticity, while leaving neuronal responsiveness intact. These findings suggest that structural changes underlying ocular dominance plasticity occur rapidly following monocular occlusion, and cortical changes guide subsequent alterations in thalamocortical afferents.

Animals↗
PubMed2003

Enhanced film-forming properties for ethyl cellulose and starch acetate using n-alkenyl succinic anhydrides as novel plasticizers.

PURPOSE: The aim of this study was to investigate the ability of n-alkenyl succinic anhydrides (n-ASAs) to improve the film-forming characteristics of a novel coating polymer, potato starch acetate degree of substitution 2.8 (SA). n-ASAs were also applied to improve the otherwise brittle properties of ethyl cellulose (EC) aqueous dispersion (Aquacoat) and EC solvent-based films. METHODS: The effectiveness of two n-ASAs, 2-octenyl succinic anhydride (OSA) and 2-dodecen-1-ylsuccinic anhydride were evaluated as plasticizers. Mechanical properties, both water vapor and drug permeabilities, and glass transition temperatures of the cast free films were measured. Triethyl citrate and dibutyl sebacate were used as reference plasticizers. RESULTS: The long hydrocarbon chain of n-ASA, with its accessible carbonyl groups, enabled a strong plasticization effect on the tested polymers. Due to the excellent mechanical properties (i.e., a tough film structure with considerable flexibility) and low permeability of the plasticized films, n-ASAs, and especially OSA proved to be an ideal plasticizer particularly for EC based coatings. Also, the EC aqueous dispersion plasticized with n-ASAs resulted in a markedly enhanced coalescence of the colloidal polymer particles, even at low drying temperatures. CONCLUSIONS: In applications where a coating with high flexibility is required, n-ASAs can be used as plasticizers at moderately high concentrations (up to 60-70%, w/w) without losing the high tensile strength, excellent toughness and low permeability of EC and SA films.

Algorithms↗
PubMed1996

Possible involvement of neuromodulatory systems in cortical Hebbian-like plasticity.

Plasticity of neuronal covariances (functional plasticity) is controlled by behavior (Ahissar et al (1992) Science 257, 1412-1415). Whether this behavioral control involves neuromodulatory systems was tested by examining the effect of acetylcholine (ACh) and noradrenaline (NE) on functional plasticity in anesthetized animals and by comparing the effects of these neuromodulators in an anesthetized preparation to that of behavior in awake animals. Local ionotophoretic applications of these drugs during manipulations of activity covariance in guinea pig auditory cortex did not mimic the behavioral control of functional plasticity that was previously observed in awake monkeys. Thus, the hypotheses according to which these neuromodulators control functional plasticity independent of their concentration and time of release were not supported by our data. The significant plasticity induced nevertheless, by some of the conditionings in the presence of ACh and NE, suggests that factors, other than those that were experimentally controlled, could regulate this plasticity. These factors could be among others the timing of drug(s) applications relative to the conditioning time, the local concentrations of the drug(s) and/or the site of application with respect to the relevant synapses.

Acetylcholine↗
PubMedDate not supplied

Plasticized waxy maize starch: effect of polyols and relative humidity on material properties.

The plasticizing effect of different polyols such as glycerol, xylitol, sorbitol, and maltitol on waxy maize starch was investigated. The concentration of plasticizer was fixed at 33 wt % (dry basis of starch). The structure and mechanical performance of resulting films conditioned at different relative humidity levels were studied in detail. The effect of the plasticizer on the glass-rubber transition temperature (T(g)) and crystallinity was characterized using differential scanning calorimetry. It was found that T(g) decreases with increasing moisture content and decreasing molecular weight of the plasticizer. The water resistance of starch increased steadily with the molecular weight of the plasticizer and was directly proportional to the ratio of the end to total hydroxyl groups. As the molecular weight of the plasticizer increased, the brittleness of the dry system increased. However, the use of high molecular plasticizer allowed good mechanical properties of the moist material to be obtained in terms of both stiffness and elongation at break.

Humidity↗
PubMedDate not supplied

Preparation and properties of plasticized poly(lactic acid) films.

Poly(lactic acid), PLA, was blended with monomeric and oligomeric plasticizers in order to enhance its flexibility and thereby overcome its inherent problem of brittleness. Differential scanning calorimetry, dynamic mechanical analysis, transmission electron microscopy, and tensile testing were used to investigate the properties of the blends. Monomeric plasticizers, such as tributyl citrate, TbC, and diethyl bishydroxymethyl malonate, DBM, drastically decreased the T(g) of PLA, but the blends showed no morphological stability over time since rapid cold crystallization caused a size reduction of the amorphous domains in PLA. Consequently, the ability of PLA to accommodate the plasticizer diminished with the increase in crystallinity and migration of the plasticizer occurred. Increasing the molecular weight of the plasticizers by synthesizing oligoesters and oligoesteramides resulted in blends that displayed T(g) depressions slightly smaller than with the monomeric plasticizers. The compatibility with PLA was dependent on the molecular weight of the oligomers and on the presence or not of polar amide groups that were able to positively interact with the PLA chains. Aging the materials at ambient temperature revealed that the enhanced flexibility as well as the morphological stability of the films plasticized with the oligomers could be maintained as a result of the higher molecular weight and the polar interactions with PLA.

Lactic Acid↗
PubMed2003

Molecular determinants of the influence of hydrophilic plasticizers on the mechanical properties of cast wheat gluten films.

The influence of a set of hydrophilic plasticizers varying in their chain length (ethyleneglycol and longer molecules) on the tensile strength and elongation at break of cast gluten films was studied. When considered on a molar basis (moles of plasticizer per mole of amino acid), the effect of the different plasticizers depended on their respective molecular weights for plasticizer/amino acid ratios in the range from 0.10 to 0.40. However, above a ratio of 0.40-0.50 mol/mol of amino acid, these differences were abolished and both stress and strain reached a plateau value, with all plasticizers studied. In fact, when a homologous series of molecules was considered, the ability for plasticizer to decrease stress and increase strain was closely related to the number of hydrogen bonds the molecule was able to share with the protein network. Ethyleneglycol's efficiency was, however, lower than expected from its hydrogen-bonding potential; a comparison with other diols demonstrated that this was due to the small size of this molecule. The particular effect of glycerol concentration on the films' mechanical properties suggested that other molecular features of the plasticizer, such as the number and position of hydroxide groups in the molecule, were involved in the plasticization mechanism.

Ethylene Glycol↗
PubMed2003

Plastic or metal stents for malignant stricture of the common bile duct? Results of a randomized prospective study.

BACKGROUND: The systematic use of metal stents to treat biliary obstruction is restricted by high cost compared with plastic stents. The aims of this study were to compare cost and efficacy of plastic stents and metal stents in the treatment of patients with malignant common bile duct strictures and to define factors that predict survival of these patients. METHODS: One hundred eighteen patients (mean age 75 years) with malignant strictures of the common bile duct were randomized to placement of a plastic stent or metal stent. Comparisons were made with the Mann-Whitney or chi-square test as indicated; survival rates were compared with a Cox proportional hazards model. RESULTS: There was no significant difference in survival between the two groups. Time to first obstruction was longer for patients in the metal stent group (metal stent, median not reached vs. plastic stent, 5 months; p = 0.007). The number of additional days of hospitalization, days of antibiotic therapy, and the numbers of ERCPs and transabdominal US procedures was significantly higher in the plastic stent group. After multivariate analysis, only the presence of liver metastases was independently related to survival (p < 0.0005; OR = 2.25). This variable defined a group with a shorter survival. Median survival of patients with hepatic metastasis at diagnosis was 2.7 months compared with 5.3 months for patients without liver metastasis; in the latter group, the overall cost associated with metal stents was lower than for plastic stents. CONCLUSIONS: Metal stent placement is the most effective treatment of inoperable malignant common bile duct stricture. Placement of a metal stent is cost effective in patients without hepatic metastases, whereas a plastic stent should be placed in patients with spread of the tumor to the liver.

Aged↗
PubMedDate not supplied

Comparison of isopropanol and isooctane as food simulants in plasticizer migration tests.

In the last 25 years, plastics have faced a massive demand in packaging technology due to their desirable properties, such as flexibility, light weight, etc. Moreover, their packaging applications have spread in the area of food and pharmaceutical products. Much concern has arisen from that fact as most of these plastics contain high amounts of additives which tend to migrate when they come into contact with liquid or solid surrounding media. Plasticized PVC is one of the most popular polymers in packaging technology and at the same time is subject to criticism for the high concentration levels of plasticizer in most of its applications. In an attempt to carry out simple and realistic migration tests, many investigators used simple organic substances which simulate as much as possible the behaviour of foods towards plasticizer migration. Much of our previous work intended to examine migration of dioctyl phthalate (DOP) from PVC sheets into some simple surrounding media, such as methanol, white spirit, paraffin oil, etc. The present work is focused on the examination of the plasticizer migration into two promising food simulants, namely isopropanol and isooctane. Radioactivity measurements were employed in order to detect quantitatively the plasticizer which had migrated into the surrounding liquid. In contrast to similar studies, the phenomenon of migration was studied until equilibrium was reached.

2-Propanol↗
PubMed1989

Chemical and biological characterization of products of incomplete combustion from the simulated field burning of agricultural plastic.

Chemical and biological analyses were performed to characterize products of incomplete combustion emitted during the simulated open field burning of agricultural plastic. A small utility shed equipped with an air delivery system was used to simulate pile burning and forced-air-curtain incineration of a nonhalogenated agricultural plastic that reportedly consisted of polyethylene and carbon black. Emissions were analyzed for combustion gases; volatile, semi-volatile, and particulate organics; and toxic and mutagenic properties. Emission samples, as well as samples of the used (possibly pesticide-contaminated) plastic, were analyzed for the presence of several pesticides to which the plastic may have been exposed. Although a variety of alkanes, alkenes, and aromatic and polycyclic aromatic hydrocarbon (PAH) compounds were identified in the volatile, semi-volatile, and particulate fractions of these emissions, a substantial fraction of higher molecular weight organic material was not identified. No pesticides were identified in either combustion emission samples or dichloromethane washes of the used plastic. When mutagenicity was evaluated by exposing Salmonella bacteria (Ames assay) to whole vapor and vapor/particulate emissions, no toxic or mutagenic effects were observed. However, organic extracts of the particulate samples were moderately mutagenic. This mutagenicity compares approximately to that measured from residential wood heating on a revertant per unit heat release basis. Compared to pile burning, forced air slightly decreased the time necessary to burn a charge of plastic. There was not a substantial difference, however, in the variety or concentrations of organic compounds identified in samples from these two burn conditions. This study highlights the benefits of a combined chemical/biological approach to the characterization of complex, multi-component combustion emissions. These results may not reflect those of other types of plastic that may be used for agricultural purposes, especially those containing halogens.

Agriculture↗
PubMed2002

Influence of plasticizer type and coat level on Surelease film properties.

Two commercially available formulations of aqueous ethylcellulose dispersion differing in their plasticizer, i.e., Surelease/E-7-7050 containing dibutyl sebacate (DBS) and Surelease/E-7-7060 containing glyceryl tricaprylate/caprate (GTC), were evaluated and compared for their film properties as a function of polymeric coat level. Ibuprofen tablets were coated at 1, 2, 3, and 5% w/w levels using each Surelease formulation, and the coated tablets were evaluated for their drug release characteristics, coat reflectivity (gloss), surface texture, Brinell hardness, and elastic modulus. The drug release was dependent on the coat level and followed Hixson-Crowell cube-root model at 1% coat level. However, at > or = 2% coat levels, the release from tablets coated with GTC plasticized formulation appeared to be best described by non-Fickian release mechanism and that from tablets coated with DBS plasticized formulation appeared to follow apparent zero-order release mechanism. At equal coat levels, tablets coated with GTC plasticized Surelease yielded lower drug release rates, higher reflectivity (gloss), lower surface roughness, higher Brinell hardness, and lower elastic modulus than those coated with DBS plasticized formulation. A good correlation was observed between the drug release rates and the reflectivity and surface texture of the coated tablets. The film-coats of GTC plasticized formulation were harder and more elastic than those of DBS plasticized formulation indicating better mechanical integrity.

Cellulose↗
PubMed2001

Modulation of practice-dependent plasticity in human motor cortex.

Motor practice may lead to expansion of trained representations in the motor cortex, but it is unknown whether this practice-dependent plasticity can be purposefully enhanced or depressed. Evidence, mainly based on animal experiments, indicates that the activity of GABA-related cortical inhibition is important in controlling the extent to which plasticity may occur. We tested the role of GABA in modulating practice-dependent plasticity in the human motor cortex. A decrease in GABA-related cortical inhibition was achieved by ischaemic nerve block (INB) in the hand by deafferentation/deefferentation and an increase was achieved by administration of the GABA(A) receptor agonist lorazepam. In Experiment 1, healthy subjects performed motor practice (MP), consisting of repeated ballistic contractions of the biceps muscle in the absence (MP alone) or presence of INB (MP+INB). Changes in the biceps motor cortex representation were assessed by transcranial magnetic stimulation (TMS). MP+INB resulted in a dramatic increase in the size of the motor evoked potential (MEP) and in paired-pulse excitability compared with mild or no changes in the MP-alone and INB-alone conditions. In Experiment 2, this dramatic increase in biceps representation induced by MP+INB was replicated when subjects were pretreated with placebo, but this increase was prevented or even switched to a decrease when subjects were pretreated with lorazepam. These findings indicate that a decrease in GABA-related inhibition facilitates practice-dependent plasticity in the human motor cortex, whereas an increase depresses it. In Experiment 3, practice-dependent plasticity (assessed by TMS, as in the first two experiments) was also tested at the behavioural level. The dramatic increase in biceps MEP size induced by MP+INB was paralleled by an increase in peak acceleration of the fastest elbow flexion movements. Similarly, the lack of change in MEP size in the MP-alone condition was paralleled by a lack of change in peak acceleration. We propose that changes in GABA activity may be instrumented to modulate plasticity purposefully; for instance, to enhance plastic change and recovery of function after a lesion in neurological patients.

Adult↗
PubMed2006

Structural and functional plasticity in the somatosensory cortex of chronic stroke patients.

Animal studies have demonstrated that motor recovery after hemiparetic stroke is associated with functional and structural brain plasticity. While studies in stroke patients have revealed functional plasticity in sensorimotor cortical areas in association with motor recovery, corresponding structural plasticity has not been shown. We sought to test the hypothesis that chronic hemiparetic stroke patients exhibit structural plasticity in the same sensorimotor cortical areas that exhibit functional plasticity. Functional MRI during unilateral tactile stimulation and structural MRI was conducted in chronic stroke patients and normal subjects. Using recently developed computational methods for high-resolution analysis of MRI data, we evaluated for between-group differences in functional activation responses, and cortical thickness of areas that showed an enhanced activation response in the patients. We found a significant (P < 0.005) increase in the activation response in areas of the ventral postcentral gyrus (POG) in the patients relative to controls. These same ventral POG areas showed a significant (P < 0.05) increase in cortical thickness in the patients. Control cortical areas did not show a significant between-group difference in thickness or activation response. These results provide the first evidence of structural plasticity co-localized with areas exhibiting functional plasticity in the human brain after stroke.

Adult↗
PubMed2005

Modification of practice-dependent plasticity in human motor cortex by neuromodulators.

Practice-dependent plasticity underlies motor learning in everyday life and motor relearning after lesions of the nervous system. Previous studies showed that practice-dependent plasticity is modifiable by neuromodulating transmitters such as norepinephrine (NE), dopamine (DA) or acetylcholine (ACh). Here we explored, for the first time comprehensively and systematically, the modifying effects of an agonist versus antagonist in each of these neuromodulating transmitter systems on practice-dependent plasticity in healthy subjects in a placebo-controlled, randomized, double-blind crossover design. We found that the agonists in all three neuromodulating transmitter systems (NE: methylphenidate; DA: cabergoline; ACh: tacrine) enhanced practice-dependent plasticity, whereas the antagonists decreased it (NE: prazosin; DA: haloperidol; ACh: biperiden). Enhancement of plasticity under methylphenidate and tacrine was associated with an increase in corticomotoneuronal excitability of the prime mover of the practice, as measured by the motor evoked potential amplitude, but with a decrease under cabergoline. Our findings demonstrate that agonists and antagonists in various neuromodulating transmitter systems produce significant and oppositely directed modifications of practice-dependent plasticity in human motor cortex. Enhancement of plasticity occurred through different strategies that either favoured extrinsic (NE, ACh) or intrinsic (DA) modulating influence on the motor cortical output network.

Adaptation, Physiological↗
PubMed2003

Treatment of plastic and extracellular matrix components with chlorhexidine or benzalkonium chloride: effect on Candida albicans adherence capacity in vitro.

This study investigates the influence of treatment of plastic and extracellular matrix (ECM) proteins with chlorhexidine or benzalkonium chloride on subsequent adherence of Candida albicans. Three concentrations were tested for each antiseptic: (i) chlorhexidine, MIC (6.25-12.5 mg/L), 80 x MIC and 800 x MIC; and (ii) benzalkonium chloride, MIC (3.12 mg/L), 40 x MIC and 1600 x MIC. Chlorhexidine and benzalkonium chloride activities were correlated with the tested concentrations. Antiseptics used at MIC were unable to modify the adherence to plastic or ECM proteins. Chlorhexidine (80 x MIC) induced a decrease in plastic adherence of 31% of the 15 strains used and an increase in ECM protein adherence of 13% of strains. Benzalkonium chloride (40 x MIC) induced a decrease in adherence to ECM proteins or plastic of 13-27% of strains. Our results indicated that the treatment with 1600 x MIC benzalkonium chloride could induce the opposite effect on adherence, depending on the surface: 60% of the strains showed an increase in their adherence to ECM proteins, whereas 93% of the strains showed a decrease in their adherence to plastic. A similar phenomenon was observed after treatment with 800 x MIC chlorhexidine: 60% of the strains showed an increase in their adherence to ECM proteins, whereas 67% showed a decrease in adherence to plastic. Treatment of medical devices with at least 5000 mg/L of chlorhexidine or benzalkonium chloride could therefore reduce C. albicans adherence to plastic surfaces, but would be unable to prevent fungal adherence to ECM proteins.

Anti-Infective Agents, Local↗
PubMed2004

Effects of triclosan incorporation into ABS plastic on biofilm communities.

OBJECTIVE: This study compared the attached biofilm populations on acrylonitrile-butadiene-styrene (ABS) plastic with and without the incorporation of the antimicrobial triclosan [5-chloro-2-(2,4-dichlorophenoxy) phenol] after 1-3 weeks of exposure to drinking water. METHODS: Biofilms were cultivated on triclosan-incorporated (TP) and control plastics (CP) in continuous flow culture reactors with drinking water as the growth medium and inoculum. After 1-3 weeks of exposure, the plastics were removed and the biofilms aseptically harvested. The attached communities were examined with respect to direct cell counts, culturability, triclosan resistance and community composition. RESULTS: Based on these analyses, no significant differences were observed between the populations attached to TP and CP surfaces. Results from both a bioavailability assay and gas chromatography mass spectrometry analyses, revealed that only trace amounts of triclosan desorbed from the plastic. The lack of biofilm community difference, coupled with this limited desorption of triclosan from the TP indicates that the ABS plastic studied was no more effective at controlling bacterial populations than the control plastic because the antimicrobial was not bioavailable. CONCLUSIONS: These results call into question the long-term utility of triclosan incorporation into ABS plastic and highlight the need for proof of efficacy regarding the antimicrobial properties of such materials.

Acrylonitrile↗
PubMed2006

Comparison of plastic single-use and metal reusable laryngoscope blades for orotracheal intubation during rapid sequence induction of anesthesia.

BACKGROUND: Plastic single-use laryngoscope blades are inexpensive and carry a lower risk of infection compared with metal reusable blades, but their efficiency during rapid sequence induction remains a matter of debate. The authors therefore compared plastic and metal blades during rapid sequence induction in a prospective randomized trial. METHODS: Two hundred eighty-four adult patients undergoing general anesthesia requiring rapid sequence induction were randomly assigned on a weekly basis to either plastic single-use or reusable metal blades (cluster randomization). After induction, a 60-s period was allowed to complete intubation. In the case of failed intubation, a second attempt was performed using metal blade. The primary endpoint of the study was the rate of failed intubations, and the secondary endpoint was the incidence of complications (oxygen desaturation, lung aspiration, and oropharynx trauma). RESULTS: Both groups were similar in their main characteristics, including risk factors for difficult intubation. On the first attempt, the rate of failed intubation was significantly increased in plastic blade group (17 vs. 3%; P < 0.01). In metal blade group, 50% of failed intubations were still difficult after the second attempt. In plastic blade group, all initial failed intubations were successfully intubated using metal blade, with an improvement in Cormack and Lehane grade. There was a significant increase in the complication rate in plastic group (15 vs. 6%; P < 0.05). CONCLUSIONS: In rapid sequence induction of anesthesia, the plastic laryngoscope blade is less efficient than a metal blade and thus should not be recommended for use in this clinical setting.

Adult↗
PubMed1997

Alma Dea Morani, MD: a pioneer in plastic surgery.

Alma Dea Morani was the first female member of the American Society of Plastic and Reconstructive Surgeons. She is now retired from active practice and living in Philadelphia, but her life continues to reflect her role as a plastic surgeon. She was drawn to medicine by the Women's Medical College of Pennsylvania (now part of Allegheny University), graduating in 1931. Her love of art, which she learned from her sculptor/father, Salvatore Morani, drew her to plastic surgery. Her difficulty obtaining training in the specialty would have caused others to abandon the goal, but she pursued it with great vigor. Her career path as a plastic surgeon was diverse and challenging. She returned to the Women's Medical College to start her practice, treating the broad spectrum of problems that we all see, and rose to the rank of clinical professor of surgery. In that capacity she was a role model for a whole generation of women who, in turn, acted as mentors for many others to pursue careers in plastic surgery. Dr Morani never shied from politics, playing an international role in women's issues in health care and medical education. Throughout all of this she maintained her interest in art not only as a collector, but as an artist, creating her own works until just a few years ago. Dr Morani was the driving force behind the creation of the Morani Gallery of Art at the Medical College of Pennsylvania. This facility is the only ongoing art gallery and collection at any medical school in the United States. As a tribute to her, the chair of surgery at Allegheny University is endowed in her name. She continues to serve as an inspiration to all of us-from medical students to practicing physicians of all types-not only with her ideas, but with the realization that through active participation with the world of art we become stronger, more humane physicians. Alma Dea Morani has inspired a generation of women to pursue careers in plastic surgery. At 89 years of age she continues to serve as an inspiration to young physicians, especially women, who wish to combine the skills of a plastic surgeon with an appreciation of the role of art in the maturation of the individual.

Art↗